文献类型：期刊文献

英文题名：Poly(ethylene oxide) macromonomer-grafted polymer nanoparticles synthesised by emulsifier-free emulsion polymerisation

作者：Liu, Zuifang[1]; Xiao, Huining[2]; Wiseman, Nicholas[1]; Zheng, Anna[3]

机构：[1]Univ New Brunswick, Dept Chem Engn, Fredericton, NB E3B 5A3, Canada;[2]UMIST, Dept Paper Sci, Manchester M60 1QD, Lancs, England;[3]E China Univ Sci & Technol, Inst Mat Sci & Engn, Shanghai 200237, Peoples R China

年份：2003

卷号：281

期号：9

起止页码：815

外文期刊名：COLLOID AND POLYMER SCIENCE

收录：;EI(收录号：2003407661877);WOS:【SCI-EXPANDED(收录号:WOS:000185116800002)】；

语种：英文

外文关键词：emulsifier-free emulsion polymerisation; poly(ethylene oxide); quaternary ammonium monomer; polymer nano- or microparticles; transmission electron microscopy

摘要：Ultrafine polymer nanoparticles based on poly(ethylene oxide) (PEO) macromonomer-grafted polystyrene (PS) have been synthesised by emulsifier-free emulsion polymerisation. In addition to the binary copolymerisation between PEO macromonomer and styrene, ternary copolymerisations were also conducted in the presence of a cationic monomer (2-(methacryloyloxy)ethyl) trimethylammonium chloride (MATMAC) as a second comonomer. The size and charge characteristics of fine nanoparticles were characterised using both photon correlation spectroscopy and transmission electron microscopy techniques as well as colloidal titration. It was found that after PEO chains (repeat unit 9 or higher) were incorporated into the PS latex, the particle size was significantly reduced owing to the steric effect contributed from grafted PEO chains. Ternary copolymerisation using MATMAC as comonomer further reduced the particle size, leading to nanoparticles as small as 60 nm. Increasing the MATMAC feed ratio gradually reduced the final size of the nanoparticle, owing to the enhancement in electrostatic stabilisation, whereas increasing the PEO macromonomer feed ratios led to slightly larger particles but significantly inhibited the agglomeration of primary particles. The formation mechanism of the nano- or microparticles with various sizes during polymerisation is discussed in terms of nucleation, agglomeration and adsorption of primary particles.